Commit 1b00e0df authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Daniel Borkmann
Browse files

bpf: update skb->protocol in bpf_skb_net_grow 



Some tunnels, like sit, change the network protocol of packet.
If so, update skb->protocol to match the new type.

Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Reviewed-by: default avatarAlan Maguire <alan.maguire@oracle.com>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 2aad3261

net/core/filter.c

+8 −0
Original line number Diff line number Diff line
@@ -3081,6 +3081,14 @@ static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 


			skb_set_transport_header(skb, mac_len + nh_len);

		}



		/* Match skb->protocol to new outer l3 protocol */

		if (skb->protocol == htons(ETH_P_IP) &&

		    flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)

			skb->protocol = htons(ETH_P_IPV6);

		else if (skb->protocol == htons(ETH_P_IPV6) &&

			 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)

			skb->protocol = htons(ETH_P_IP);

	}



	if (skb_is_gso(skb)) {

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